Automatic disk blade grinder



Oct. 31, 1950 c, VAN ALLEN 2,528,193

AUTOMATIC DISK BLADE GRINDER Filed Nov. 15, 19 6 5 Sheets-Sheet 1 Inventor Uizaa/ZI an flZZen Z5 A m m eys Oct. 31, 1956 c, VAN ALLEN 2,528,193

AUTOMATIC DISK BLADE GRINDER Filed Nov. 15, 1946 5 Sheets-Sheet 2 In L'ento r Attorneys Oct. 31, 1950 g, VAN ALLEN 2,528,193

AUTOMATIC DISK BLADE GRINDER Filed Nov. 15, 1946 5 Sheeis Sheet s WWW A tla rneys Oct. 31, 1950 c. R. VAN ALLEN AUTOMATIC DISK BLADE GRINDER Filed Nov. 15, 1946 5 Sheets-Sheet 4 4' Invent/n 1' y w ca a:

A rm rneyx @c&. 31, 1956 c, VAN ALLEN 2,523,193

AUTOMATIC DISK BLADE GRINDER Filed Nov. 15,1946 5 Sheets-Sheeti a r r 77 In l'entm' 6%asRVZzn fllien .1 [1 1 may;

Patented Oct. 31, 1950 UNITED STATES PATENT o-FFICE AUTOMATIC DISK BLADE GRINDER Charles R. Vanrillen, Williston, N. Dak.

Application November 15, 1946, Serial No. 710,050

, 7 Claims. 1

This invention relates to a machine for grinding disk-type blades of plows or similar implements and has particular reference to a machine which is capable of being adjusted and thereafter power-operated for grinding the edge of a disktype blade to a predetermined bevel and throughout the entire circumference of the blade.

More particularly, it is an object of the invention to provide a machine having a driven grinding element and a driven detachable mounting means for a disk-type blade whereby a blade may be supported on the mounting means and revolve as the edge thereof is ground.

Still a further object of the invention is to provide yieldable means for urging the edge portion of the blade into engagement. with the grinding element and stop means for limiting the ex: tent to which theedges of blades can be ground, and for insuring a uniform grinding Of all portions of the circular edge of the blade.

Still a further object 'of the invention is to provide manually actuated adjustable means for adjustably disposing the blade supporting structure with respect to the grinding element for varying the depth and angle of the grinding operation.-

Still another object. of the invention is to pro.- vide means, actuated by the driving means of the grinding element for laterally displacing said grinding element, during the operation thereof, for insuring uniform wear on the grinding element and a resulting uniform engagement with the work.

Still another object of the invention is to provide means actuated by the driving means of the grinding element for supplying a liquid under pressure to be discharged onto the surface of the work and at the point thereof engaged by the grinding element.

Various other objects and advantages of the invention will hereinafter become more fully apparent from the following description of the drawings, illustrating a preferred embodiment thereof, and wherein:

Figure 1 is a side elevational view of blade grinding machine;

Figure 2 is a longitudinal substantially central sectional view thereof;

Fig. 3 is a side'elevational view on a reduced scale from the opposite side thereof to the side as illustrated in Figure 1;

Figure 4 is an enlarged transverse sectional iew through a portion of the blade supporting structure and showing the power take-off means for revolving a portion of said Structure;

the disk- Figure 5 is a transverse verticalsectional View taken substantialy along a plane as indicated by the line 55 of Figure 3;

Figure 6 isa sectional view taken substantially along a plane as indicated by the line 6 6 of Figure 1;

Figure 7 is a transverse vertical sectional view taken substantially alonga plane as indicated by the line 'l-'l of Figure 1;

Figure 8 is a horizontal sectional view taken substantially along a plane as indicated by the line 88 of Figure 1;

Figure 9 is an enlarged cross sectional view taken substantially along the plane as indicated by the line 9 9 of Figure 8, and

Figures 10 and 11 are sectional views taken substantially along planes as indicated by the lines Iii-46 and I l--l l, respectively, of'F-igure 1.

Referring more specifically to the drawings, the improved grinding machine in its entirety is designated generally 12 and includes a substantially horizontally disposed supporting frame or table l3 which is supported in an elevated position with respect to any suitable supporting surface by means of depending supporting legs M which are secured to and depend from the four corners of the table or frame IS.

The table or frame I 3 is provided with dependin sides or flanges in one of which is formed a bearing or journal l5, as seen in Figures 2 andB, for receiving and journaling an unthreaded portion 16 of a feed screw I! which is disposed beneath the table top and which extends longitudinally thereof. The unthreaded portion [6 is retained in the hearing or journal 15 by means of collars l8 which are fixed to the feed screw I! and on opposite sides of the bearing 15. The feed screw ll has one end projecting outwardly from the bearing l5 and to which a hand wheel ii! is keyed. As bestillustrated in Figure 8, the 'top portion of the table or frame i3 is provided with a relatively large central opening 20, beneath which the feed screw H is disposed.

A pair of longitudinally disposed guide rods 21 are supported above thetop surface of the table 13 and adjacent its side edges and longitudinally thereof by upstanding supporting brackets 22 which are fixed to the table 53 and in which-the ends of the rods 2! are secured. The rods 2| are disposed substantially parallel 'to one another and to the feed screw 1 l, as seen in Figure 8,,

As best seen in Figures '7 and 8, a platform 23 is supported above the table 13 and transversely thereof by means of; the rods 2!; said platform being provided with sleeves 24 at the ends thereof which slidably engage the rods 2! for supporting the platform transversely of and across the opening and for movement in a direction longitudinally of said opening and of the table 13. As best seen in Figure 2, the platform 23 is provided with a depending bracket 25 for supporting an internally threaded sleeve 25 through which the feed screw ll extends and in which said feed screw is threadedly engaged whereby the platform 23 will be moved lengthwise of the table l3 when the hand wheel 49 is revolved.

The platform 23 is provided with a pair of longitudinally spaced and aligned upstanding bearings 21 in which a shaft 28 is j ournaled. One end of the shaft 28 extends beyond the side edge 29 of the table l3 and has a lever 39 keyed to the terminal thereof and depending from the shaft 28 beyond said side edge 29, as best seen in Figure '1. As best seen in Figures 1 and 11, a sleeve 3i is slidably keyed to the lever 39 and is provided with a laterally projecting arm 32 fo journaling a pin 33 which extends therethrough and which projects laterally from an internally threaded sleeve 34 which is thus supported through the arm 32 and pin 33 for swiveling movement with respect to the sleeve'Sl. The internally threaded sleeve 34 is adapted to threadedly engage a feed screw 35 which is disposed substantially parallel to the lever and which has an unthreaded upper portion which is journaled in a bearing 35. The bearing is formed integral with an arm 31 which is in turn formed integral with the upper part of the lever 30. The feed screw 35 has a portion which extends to above the bearing 36 and which terminates in an off-set terminal forming a crank 38. As best seen in Figure ll, a pin 39 projects laterally and in a direction outwardly from the sleeve 3! to provide a journal for a sleeve 40 which is detachably retained on the pin 39 by a collar M. A sleeve 42 is secured to or formed integral with the sleeve 40 and disposed at substantially a right angle thereto and provides a journal for an unthreaded portion 43 of a screw 44, the threaded end of which projects from the sleeve or bearing 42 in a direction away from the hand wheel W. The screw M- is provided with an opposite, unthreaded end which projects toward the hand wheel [9 and from the opposite end'of the bearing 42 and which terminates in a laterally off-set terminal forming a crank 45. The threaded end of the screw 44 engages an internally threaded sleeve 45 which extends therefrom and which is adjustable with respect thereto through the turning of the crank 45. A locknut M is preferably carried by the screw 54 for bearing against an end of the sleeve 46 to retain the sleeve and screw in adjusted positions. The opposite, free end of the sleeve 45 terminates in a bearing 48 which is disposed substantially at a right angle to the axis of the sleeve 46, as best seen in Figure l.

A shaft 49 is journaled in bearings 50 formed in the laterally aligned legs (4 which are disposed remote to the hand wheel H9. The shaft 49 is disposed beneath the table l3 and the ends thereof protrude outwardly from said legs l4 and the bearings 50 thereof. As best seen in Figures l and 10, the end of the shaft 49 which projects from the side 29 of the frame or table l3 has a crank 5i keyed thereto and which is provided with a laterally projecting arm 52 having a longitudinally disposed slot 53. A stub shaft 54 is journaled in the bearing 43 and is provided with an inwardly extending, restricted 4 and threaded extension 55 which extends loosely through the slot 53 and which is longitudinally adjustable therein. The protruding end of the threaded shank- 55 carries a nut 55 which is adapted to be tightened for clamping the shaft 5% in a plurality of longitudinally adjusted positions relatively to the arm 52 for varying the throw or stroke of the sleeve 46 and screw 44 when the crank 5| is revolved with the shaft 49.

The table or frame (3, at the end thereof remote to the hand wheel I9, is provided with a pair of transversely aligned upstanding bearings 51 in which a shaft 58 is journaled. The shaft 58 is disposed substantially directly above and parallel to the shaft 59 and has a belt pulley 59 keyed to one end thereof and disposed above the table 55 and adjacent its side edge 25. A belt 66 is trained over the pulley 59 for driving the shaft 58 from any suitable source of power, not shown. A grinding wheel 64, such as an emery wheel, is detachably and adjustably keyed to the intermediate portion of the shaft 58 by lock nuts 52 which engage a threaded intermediate portion 63 of the shaft 58. A horizontal and vertical flange of a portion of the frame or table l3 are recessed at 64 to accommodate the grinding wheel 6! and an arcuate hood or shield 65 is secured to the frame l3 and disposed over the oute portion of the emery wheel 5!. The emery wheel 5! is disposed on the shaft 53 and between its bearings or journals 5'! and substantially intermediate of the side edges of the table l3 and substantially in alignment with the longitudinal axis of the feed screw H, as clearly illustrated in Figure 8.

As best seen in Figures 3, 5 and 8, the opposite end of the shaft 58 projects beyond the opposite side edge 65 of the table 13 and has a belt pulley 5! keyed to said protruding end and provided with a V-shaped groove over which is trained a V- shaped belt 68.

As best seen in Figures 1 and 2, the legs l4, located adjacent the hand wheel I9, are provided with laterally aligned arcuate slots 59 through which a shaft 10 loosely extends. A plate H is pivotally connected at its lower end at 72 to each of the legs l4 beneath said slots 69 and said plates if each carry a bearing 13 which registers with the associated slot 69 and in which bearings said shaft 143 is journaled. The upper portion of each plate H is provided with transversely disposed arcuate slot 14 for loosely receiving a bolt 15 which projects from the leg Hi thereof. A nut 15 engages each bolt 15 and is adapted to be tightened for clamping the plate ll against the leg Hi to provide means for adjustably positioning the shaft 10 relatively to said legs M and whereby said shaft may be 'moved toward and away from the shaft 58.

A relatively large tensioning and idler belt pulley l! is keyed to the shaft '10 and outwardly of the side 66 of the frame l3. A vat or container for water or other liquid is disposed on the supporting surface of the grinder l 2 and beneath the frame 13. Said vat or container 78 contains a liquid '19, as seen in Figure 2, and is provided adjacent its bottom with an outlet 80 to which a pump 8| is connected. The pump'Bl is disposed on the outer side of the vat 18 and adjacent the side 56 of the frame 13 and includes a pump shaft 82 which projects outwardly therefrom and to which a belt pulley 83 is keyed. The inlet of the pump 8! is connected to the outlet 80 of the container l8 and said pump has an upwardly exis tending and upwardly opening outlet 8G which is connected to one end of a conduit 85. The onposite end of the conduit 85 terminates in a valved outlet 86 which may assume the form of a conventional water faucet and the bib of which is disposed to open downwardly and over the inner portion of the emery wheel SI, for a purpose hereinafter to be described. The conduit 85 extends over the upper part of the shield 55 and is secured thereto and supported thereby through a sleeve 81 which engages around a portion of the conduit 85 and which is fixed to the shield -65.

The belt 68 is trained over the idler pulley TI and the pump pulley 83 for driving said pulleys from the shaft 58 through the belt pulley 61, so that when the emery wheel BI is revolved by the shaft 58 the liquid I9 from the container It will be supplied under pressure by the pump 8| to be discharged, as controlled by the faucet 86 onto the inner portion of the emery wheel 8 I.

A standard 88 is secured to and extends upwardly from the frame I 3 at its side 6% and is provided with a transversely disposed bearing 89 at its upper end, as best seen in Figures 3 and 4. A shaft, designated generally 90 has a portion journaled in the bearing 89 and a belt pulley 9! is keyed to the outer end of the shaft 90, outwardly of the bearing 89 and the frame side 66. A small belt pulley $2 is keyed to the shaft Ill, outwardly of the pulley H and a relatively large belt pulley 93 is keyed to the opposite end of the shaft 49 and outwardly of the frame side 66. A belt 94 is trained over the pulleys BI, 92 and 93, whereby said pulleys ,SI and 93 will be driven by the pulley 92 from the belt 68, through pulley 'll' and shaft Ill, so that pulleys 92, 93 and SI and the shafts 5B and 90 are driven from the shaft 53.

It will be readily obvious that the plates II may be adjusted relatively to their supporting legs M for moving the shaft I and the belt pulleys I! and 92 toward or away from the other pulleys, previously described and located beyond the frame side 66, for decreasing or increasing the tension on the belts 68 and 94.

The shaft 28, intermediate of the bearings 21, is provided with a pair of longitudinally spaced upstanding rods or shafts 95 which are disposed substantially at right angles to the shaft '28 and which are connected at their upper ends by a crosshead 96 which is provided with a transversely disposed bearing 97, disposed substantially parallel to the rod 95. An open frame, designated generally 98 is provided with parallel sleeve portions 99 at the sides thereof and which slidably engage the rods 95; said sleeves 99 being connected adjacent their upper ends by a crossbar I 08 and adjacent their lower ends by a crossbar IUI.

The sleeves 99 and bars I00 and MI combine to form the open frame 98 and to define the opening I 02 thereof. An internally threaded sleeve I03 is carried by the upper bar Hill for threade-dly engaging a feed screw I04 which has an upper unthreaded portion journaled in the bearing 9! and a laterally offset portion disposed thereabove and forming a crank I05, as seen in Figure 1. The frame 98 is provided with hearing members Hi5 which project outwardly from the sleeves 99, on

the opposite side of the frame 98 to the sleeve Inf! and in a direction toward the emery wheel El and away from the hand wheel I9. A shaft Hill is journaled in the aligned bearings H35 and substantially parallel to the plane of the frame 98 and is keyed or rotatably connected to a collar 508 which extends upwardly from an elongated sleeve bearing I09. The sleeve bearing IE9 is thus direction away from the arm IZI.

' 6 pivotally mounted relatively to the frame 98 and extends through the opening I02 thereof and is provided with a shaft IIU which is journaled in the bearing I09. A bevel gear I II is keyed to the shaft III) and disposed at the end of the bearing I69 which is adjacent to the emery wheel 6 I. The bevel gear III is provided with an outer convex surface II2 from which projects a threaded extension II3 of the shaft III). The surface H2 is adapted to form a clamping surface for receiving the concave side of a conventional disk-type plow blade I It, a portion of which is adapted to fit flush against the surface H2 and to be clamped thereto. The threaded extension H3 extends through theconventional central opening II5 of the blade lie and the exposed end thereof is adapted to receive one or a plurality of lock nuts I I6 for clamping and keying the blade I I4 to the bevel gear I I I.

The sleeve bearing W9 is provided with a bearing Ill which projects laterally therefrom, adjacent the gear I I i and which forms a journal for the opposite end of the shaft 98'. The shaft 99, adjacent the bearing H3, is provided with a small bevel gear IE8 which meshes with and drives with the bevel gear ill for revolving the disk-blade Il i from theshaft 58 through the drive connection, previously described. The shaft 95, between the bevel gear I 88 and the bearing 89 is provided with spaced universal joints H9 and includes an extensible section E20, formed of telescoping sections, which is interposed between the universal joints 5 I9.

An arm I'Zi is rigidly fixed to and extends upwardly from the collar H38 and is adapted to be selectively connected by means of notches i22 therein to one end of a contractile coil spring 523, the opposite end of which is selectively anchored in longitudinally spaced openings of an arm I24 which extends from the upper crossbar It!) in a It will be readily obvious that the spring l23 will tend to rock the bearing H59 and the disk-blade IM, carried thereby, in a clockwise direction, as seen in Figures 1 and 2 and relatively to the frame 98 for swinging the lower portion of the blade IM toward a portion of the periphery of the grinding wheel 6|. The lower bar ml functions as a stop to be engaged by the bearing sleeve I 09 for limiting its clockwise swinging movement. The universal joints I i9 and the extensible shaft section If!) accommodate the swinging movement of the end of the shaft 953 which is journaled in the bearing II? relatively to the opposite end of said shaft, which is journaled in the bearing 89.

As best seen in Figures 3, 5, 8 and 9, a shaft I25 is journaled in bearings I25 longitudinally of the frame I3 and outwardly of its side 66 and an arm I 2'! is keyed toone end of the shaft I25 beyond an end of the frame It and adjacent to the shaft 58. The arm I2? extends upwardly and is provided at its upper free end with a downwardly opening inverted U-shaped portion lZfi having corresponding depending legs provided with longitudinal slots I29. A yoke I39 is disposed within the member M8 and is provided with outwardly projecting trunnions I3I which slidably engage the slots H29 for loosely supporting the yoke 83! in the bifurcated member I28. A collar I32 is keyed to the shaft 58 and is provided with spaced flanges 233 between which the yoke I30 is disposed.

An arm I3 projects laterally from the arm 92?, adjacent the free end of the latter, said arm I34 extending outwardly to beyond the belt pulley 93 and having a laterally projecting pin 135 which projects laterally from its free end and on which asleeve I35 is journaled, as seen in Figure 5. A bearing I 3'! is fixedly mounted on the sleeve I36 transversely thereof and journals one end of a shaft i313, the opposite end of which shaft depends downwardly on the outer side of the belt pulley 93. As seen in Figure 3, a crank I39 is keyed to the outer end of the shaft 59 and outwardly of the pulley 93 and is provided witha crank pin M6 on which a sleeve or bearing M5 is journaled. A sleeve or bearing M2 is secured to the bearing MI transversely thereof and provides a journal for the laterally turned depending end I63 of the shaft I38. It will thus be readily apparent that as the shaft 49 is revolved through its connection with the shaft 58, as previously described, the crank 239 will reciprocate the shaft I38 to oscillate the arms [3% and I2! to thereby oscillate the yoke H30 in a direction substantially longitudinally of the shaft 58 so that said yoke through engagement with the flanges I33 of the collar I32 will cause a slight reciprocating motion of the shaft 58 in the bearlugs 51 for reciprocating the emery wheel SI slightly relatively to the disk-blade I I4 and while said emery wheel is being revolved. The slidable connection of the trunnions I3: with the slots I29 permits the yoke I 30 to remain in proper en gagement with the collar I32 during the oscillating movement of the arm I21 relatively to the reciprocating movement of the shaft 5%.

From the foregoing, it will be readily appar ent how the disk-blade H4 can be mounted on and keyed to the bevel gear surface l !2. As the diameters of such plow blades ll i vary in size, after the blade H4 is mounted, as previously described, the hand wheel 9 is revolved so that the feed screw II will move the platform 23, supported by the rods 2i, either toward or away from the emery wheel BI. The crank I05 is revolved for rotating the feed screw I94 to raise or lower the frame 88 so that the combined movements of the platform 23 and frame 9% will substantially correctly adjust the blade I Hi relatively to the emery wheel GI.

The crank 45 is revolved to vary the length of the screw ll! and sleeve 46 for rocking the shaft 28 in the bearings 2'! for varying the angle of the frame 98 and bearing I 69 relatively to the periphery of the emery wheel GI to thereby angularly adjust the edge of the blade [I4 relatively to the periphery of the emery wheel 6| so that the outer, convex side of the edge of the blade will be sharpened to any desired angle or bevel by engagement with the revolving emery wheel 6!. The shaft 28 will also be rocked by the rotation of the crank 52 through the reciprocation of the connecting rod 44, 46 by which the lever 39 will be oscillated for rocking the blade H4 into and out of engagement with the emery wheel GI. The length of the stroke of the connecting rod 44, 46 can be varied by adjusting the pin 55 in the slot 53 and the length of the throw of the lever 30 can likewise be varied by turning the feed screw 35 through the crank 38 for moving the sleeve 3| upwardly on the lever 30 to reduce the throw of said lever, or downwardly thereon to increase the throw of said lever. Further, the blade I I4 is pivotally mounted relatively to the frame 98 through the pivotal support of the bearing I09 on the bearing ears I08 and is spring urged by the contractile spring I23 to yieldably retain the edge thereof in engagement with the periphery of the emery wheel and so that the blade II4 will engage the emery wheel with the proper amount of pressure applied thereto.

It will thus be seen that as the emery wheel 6| is revolved, as previously described, that the outer side of the edge of the blade IIll will be rocked into and out of engagement with the emery wheel to be sharpened to the correct bevel thereby and at the same time, the blade I! will be slowly revolved in the manner as previously described so that all portions of the circular edge of the blade H4 will be sharpened uniformly and to the same bevel. The operation of the parts as previously described, will also cause operation of the pump 8| to furnish a water pressure in the conduit so that the water can be discharged therefrom through the faucet 86 and controlled by the valve thereof, and said water will be discharged onto the emery wheel and blade at the point of engagement of said parts and substantially directly over the open top of the container 18. When the edge of the blade has been sharpened to the required bevel, the bearing I09 will abut against the lower frame bar WI and said bar will form a stop to limit further rocking movement of the blade H4 in response to the biasing action of the spring I23 to prevent the blade from being sharpened excessively and to insure sharpening to the proper, predetermined bevel.

Likewise, during the sharpening operation the shaft 58 will be reciprocated slightly in its bearings 5'! through the yoke I30 and collar I32, as previously described, to insure a uniform wearing oil? of the periphery of the emery wheel 6i and consequently a uniform sharpening operation of the blade II l.

As seen in Figure 3, the pulley 92 will be revolved at the same speed as the pulley I? and consequently and because of the small diameter of the pulley 92 relatively to the pulley TI, the belt 94 will be driven at a much slower rate than the belt 68 and will turn the larger pulleys 9| and 93 at a very slow rate of speed so that the rocking movement of the blade II i, produced by the crank 52 and the rotation of said blade, through the rotation of the shaft 99, will be at a very slow rate of speed as compared with the speed at which the emery wheel shaft 58 will be revolved, and likewise, the reciprocation of the shaft 58 through the actuation of the crank I39 will also be at a greatly reduced rate of speed.

Various modifications and changes are contemplated and may obviously be resorted to, without departing from the spirit and scope of the invention as hereinafter defined by the appended claims.

I claim:

1. A sharpening machine comprising a machine support, a driven shaft journaled thereon, a sharpening wheel keyed to said shaft, a work holder adapted to support an article to be sharpened by the sharpening wheel, said work holder including a primary and a secondary section, a platform slidably supported on the machine support for movement toward and away from the sharpening wheel, said primary section being pivotally mounted on the platform, said secondary section being pivotally mounted on the primary section and having means for supporting said article, means for moving the platform toward and away from the sharpening wheel, means for angularly adjusting the work holder as a unit relatively to the sharpening wheel for swinging said article toward and away from the sharpening wheel, means for angularly adjusting the secondary work holder section relatively to said primary section for angularly adjusting the article relatively to the sharpening wheel, means driven by said shaft for rocking the work holder for moving said article into and out of engagement with the sharpening wheel as the latter is revolved, and means driven in unison with said driven shaft for revolving a portion of the work holder including said article as the sharpening wheel is revolved.

2. A sharpening machine for disk-type blades comprising, a support, a driven shaft journaled on the support, a sharpening wheel keyed to the shaft, a platform, guides for slidably supporting the platform on th support for movement toward and away from the sharpening wheel, a pair of arms pivotally mounted on and rising from the platform, a frame supported on the arms for swinging movement therewith toward and away from the sharpening wheel, a sleeve supported in the frame and having one end extending therefrom toward the sharpening wheel, a disk-blade supporting member journaled in the sleeve and adapted to support a disk-blade thereon for engagement with the sharpening wheel, driving means connecting the supporting member and driven shaft for revolving the blade, and a crank and linkage means connecting the driven shaft to said arms for rocking the disk blade toward and away from the sharpening wheel as the wheel is revolved.

3. A sharpening machine as in claim 2, the linkage of said crank and linkage means being formed of longitudinally adjustable sections for swinging the blade toward or away from the sharpening wheel and to angularly adjust it relativel thereto.

4. A sharpening machine as in claim 2, said sleeve being pivotally mounted intermediate of its ends on the frame, and spring means connected to the sleeve and frame for yieldably urging the sleeve to rock relatively to the frame in a direction to move a portion of the disk blade into engagement with the sharpening wheel.

5. A sharpening machine .as in claim 2, the linkage of said crank and linkag means being formed of longitudinally adjustable sections for 10 swinging the blade toward or away from the sharpening wheel and to angularly adjust it relatively thereto, said sleeve being pivotally mounted intermediate of its ends on the frame, and spring means connected to the sleeve and frame for yieldably urging the sleeve to rock relatively to the frame in a direction to move a portion of the disk blade into engagement with the sharpening wheel.

6. A sharpening machine as in claim 2, a first feed screw means for moving the platform toward and away from the sharpening wheel, and

a second feed screw means for moving the frame toward and away from the platform.

7. A sharpening machine as in claim 2, the linkage of said crank and linkage means being formed of longitudinally adjustable sections for swinging the blade toward or away from the sharpening wheel and to angularly adjust it relatively thereto, a first feed screw means for moving the platform toward and awayv from the sharpening wheel, and a second feed screw means for moving the frame toward and away from the platform.

CHARLES R. VAN ALLEN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 385,666 Hadley July 3, 1888 414,565 McGehe Nov. 5, 1889 452,004 McGehe May 12, 1891 565,644 Taylor Aug. 11, 1896 575,057 Eberhardt et a1. Jan. 12, 1897 681,440 Clizbe Aug. 27, 1901 723,051 Shipp Mar. 17, 1903 799,700 Youngstrom Sept. 19, 1905 1,003,631 McCaughey Sept. 19, 1911 1,405,454 Springer Feb. 7, 1922 1,436,166 Hansen Nov. 21, 1922 1,804,347 Krug May 5, 1931 1,967,447 Nelson et al July 24, 1934 1,998,783 Leach et al Apr. 23, 1935 2,202,587 Kitchen May 28, 1940 2,213,756 Zwick Sept. 3, 1940 

